JPH08126923A - Rotor detaching system for centrifugal separator - Google Patents

Abstract

PURPOSE: To eliminate the generation of vibration caused by abnormal rotation when rotated at a high speed by making the fastening torque of screws clear when mounting a rotor on a drive shaft and surely fastening the rotor. CONSTITUTION: A torque assisting piece 4 locked by a set screw 15 is provided in a hold section 2 with ratchet, and fitting sections 6 and 7 are provided with torsion bars 3 at both ends, and at the top of the fitting section 7, a torsion cover 5 is fixed. The torque assisting piece 4 and the torsion cover 5 are provided with torque indicating sections 12 and 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to attachment / detachment of a rotor of an ultracentrifuge of a type in which a rotor used in a biotechnology field is screwed.

[0002]

2. Description of the Related Art In the past, as shown in FIG. 3, the rotor was held by hand, and the rotor fixing screw was attached and detached with one hand using a wrench.

[0003]

Since the conventional rotor attaching / detaching method uses a wrench having a simple structure, the tightening torque of the screw varies depending on the operator. If the tightening torque is insufficient, the fixing force between the rotor and the drive shaft will be small, and during high-speed rotation, abnormal rotation vibration will occur and rotation will not be possible, and it will not be possible to reliably perform centrifugal separation work. Was there.

[0004]

A torsion bar is provided between a grip portion and a screw, and an upper end portion and a lower end portion of the torsion bar are formed so that a torque causes a rotation angle difference. This is solved by using a wrench having a display unit for displaying the rotation angle difference at the upper and lower ends.

[0005]

[Function] The torsion bar provided between the grip and the screw is formed so that a torque causes a rotation angle difference (twist) between the upper and lower ends, and the rotation angle difference is displayed on the upper and lower ends of the torsion bar. The display part is locked, and the torque generated in the screw can be detected from the rotation angle difference indicated on the display part.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 3 shows a conventional attachment / detachment system. A motor (not shown) for driving the rotor 18 and a flexible shaft 16 are provided inside the ultracentrifuge (not shown), and the rotor support portion 14 is held thereon. Above the rotor 18 drive motor (not shown) is the bowl 6,
There is the rotor 18 inserted into the rotor support portion 14 therein, and the screw 10 is tightened by applying torque to the wrench 1. However, the tightening torque is an intuition of each person and may not be sufficient.

FIG. 2 shows the overall structure of the wrench 1 of the present invention. Set screw 15 is attached to grip portion 2 with ratchet.
A torque assisting piece 4 hooked by means is provided, and at both ends of the torsion bar 3, a grip portion side that can be fitted into the fitting hole 19 of the grip portion 2 with the ratchet and the fitting hole 11 of the screw 10 respectively. A torsion bar case 5 having a connecting portion 6 and a tip portion 7 and having a display portion 13 for displaying a rotation angle difference generated in the torsion bar 3 is press-fitted on the upper portion of the tip portion 7. Further, the set torque is changed by shifting the mounting position of the torque assisting piece 4 in the circumferential direction.

FIG. 1 shows an example of a rotor attachment / detachment system according to the present invention. The rotor 18 is inserted into the rotor support portion 14, and the rotor 1
8 is fitted in the fitting hole 11 of the screw 10 and the tip portion 7 of the wrench 1, and the screw 10 is tightened in the tightening direction.
Rotate with. When the screw 10 is tightened to a certain position, a friction torque is generated on the screw 10. Due to the friction torque, the torsion bar 3 provided between the screw 10 and the ratchet grip 2 is twisted, and the torsion bar case 5 fixed to the lower end of the torsion bar 3 and the torque assist fixed to the ratchet grip 2 are provided. A difference in rotation angle is generated in the piece 4 and the display portion 12 and the display portion 13 are aligned with each other.
It can be seen that is fastened to the rotor support portion 14.

[0009]

According to the present invention, by clarifying the tightening torque, the rotor can be mounted securely, abnormal vibration of the rotor can be prevented from occurring, and the safety can be improved, so that the reliability can be increased. it can. In addition, by combining the torque indicating wrench with the ratchet holding part, it is easy to tighten the screw and the operability is improved. Furthermore, the number of parts can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a rotor attaching / detaching system of the present invention.

FIG. 2 is a sectional view of a wrench according to an embodiment of the present invention.

FIG. 3 is a side view showing a conventional rotor attachment / detachment system.

[Explanation of symbols]

1 is a wrench, 2 is a ratchet grip, 3 is a torsion bar, 4 is a torque assist piece, 5 is a torsion bar case, 14 is a rotor support, 17 is a bowl, and 18 is a rotor.

Claims (2)

[Claims] 1. A rotor and a rotor attachment / detachment system for a centrifuge, wherein the rotor is fixed to a rotor support portion with a screw, and the rotor is attached / detached using a wrench having a display unit for displaying a rotation angle difference. A rotor attachment / detachment system for a centrifuge characterized by performing. 2. A case formed such that a torsion bar is connected to a grip portion having a ratchet mechanism, a tip end portion of the torsion bar engages with the screw, is fixed to the tip end portion, and covers the torsion bar. A piece attached to a position opposite to the tip of the torsion bar so as to face the case, and a matching mark formed by a line, a round hole or the like on the surfaces of the case and the piece facing each other. The centrifuge rotor attachment / detachment system according to claim 1.